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How to hang a vanity mirror 
Use mounting hooks if the mirror is large and has a heavy frame. 
Mounting hooks are ideal for vanity mirrors that weigh 15 to 30 pounds (6.8 to 13. 6 kg) and have a frame made of wood, metal, or plaster. The mounting hooks will ensure the mirror hangs correctly and is well supported on the wall.
Weigh the mirror on a bathroom scale to ensure you get mounting hooks that are strong enough to support the weight. The weight restrictions for the mounting hooks will be noted on the package.